SOLUTION: Doreen needs to prepare 36 ounces of a 15% hydrochloric acid solution. Find the amount of 18% solution and the amount of 9% solution she should mix to get this solution

Question 884760: Doreen needs to prepare 36 ounces of a 15% hydrochloric acid solution. Find the amount of 18% solution and the amount of 9% solution she should mix to get this solution
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
Do it like this one. Only the numbers are different.
-----------
Amanda wants to make 8 gal. of a 20% saline solution by mixing together a 56% saline solution and a 8% saline solution. How much of each solution must she use?
================
e = amount of 8%
f = amount of 56%
---
e+ f = 8 (total solution)
8e + 56f = 20*8 (total saline)
---
e+ f = 8
e + 7f = 20
------------ Subtract
-6f = -12
f = 2
e = 6
RELATED QUESTIONS
Doreen Schmidt is a chemist. She needs to prepare 36 ounces of a 16% hydrochloric acid... (answered by )

Doreen Schmidt is a chemist. She needs to prepare 36 ounces of a 17% hydrochloric acid... (answered by stanbon)

Doreen Schmidt is a chemist. She needs to prepare 36 ounces of a 17% hydrochloric acid (answered by josgarithmetic,greenestamps)

Doreen Schmidt is a chemist. she needs to prepare 32 ounces of a 15% hydrochloric acid... (answered by ankor@dixie-net.com)

Doreen Schmidt is a chemist. She needs to prepare 28 ounces ounces of a 99%... (answered by josgarithmetic)

doreen schmidt is a chemist. she needs to prepare 32 ounces of a 13% hydrochloric acid... (answered by nyc_function)

Doreen Schmidt is a chemist. She needs to prepare 28 ounces of a 8% hydrochloric acid... (answered by richwmiller)

Doreen Schmidt is a chemist. She needs to prepare 24 ounces of a 7 % hydrochloric acid... (answered by mananth)

Doreen Schmidt is a chemist. She needs to prepare 28 ounces of a 8% hydrochloric acid... (answered by Alan3354)